help me plezz

first time mom here my mother in law came over to let my husband and i sleep a little so she watched our 3 day old son. hes brestfeed and feeding every 2 to 4 hours. i have had problums with my production and have to supplement feed abput 10ccs of formula or pre pumped in a bottle but always haveing him try breast first. he laways latches well for my breast. well she came over a 2 and we woke up at 4 30 he had just ate before she got there so he should have been fine for the time we were asleep but she feed him 20ccs of pre pump and then before we woke up she feed him a whole ounce of formula 😯😯😓 im freaking out im so scared he wont latch after being on a bottle so long and im terrified his little belly streched from all of that milk and i wont beable to keep up with hi. demand now